Update Docker Registry URLs to HTTPS endpoint (registry.michaelschiemer.de)

- Replace git.michaelschiemer.de:5000 (HTTP) with registry.michaelschiemer.de (HTTPS)
- Update all Ansible playbooks and configuration files
- Update CI/CD workflows to use HTTPS registry endpoint
- Update Docker Compose files with new registry URL
- Update documentation and scripts

Benefits:
- Secure HTTPS connection (no insecure registry config needed)
- Consistent use of HTTPS endpoint via Traefik
- Better security practices for production deployment

deployment/CODE_CHANGE_WORKFLOW.md

@@ -159,9 +159,9 @@ git push origin feature/new-feature
 - Image Metadata generieren (Tag: <short-sha>-<timestamp>)
 - Docker Image Build (Dockerfile.production)
 - Image mit Tags pushen:
-  - git.michaelschiemer.de:5000/framework:latest
-  - git.michaelschiemer.de:5000/framework:<tag>
-  - git.michaelschiemer.de:5000/framework:git-<short-sha>
+  - registry.michaelschiemer.de/framework:latest
+  - registry.michaelschiemer.de/framework:<tag>
+  - registry.michaelschiemer.de/framework:git-<short-sha>
 ```
 
 #### Job 3: Deploy (ca. 2-4 Minuten)